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<!DOCTYPE html> | |
<html> | |
<meta name="viewport" content="width=device-width, user-scalable=no"> | |
<head><title>SOUND</title></head> | |
<body> | |
<style> | |
button{ | |
height:100px; | |
width:100px; | |
} | |
body { | |
font-family:Verdana, Geneva, sans-serif; | |
font-size:medium; | |
text-align: center; | |
} | |
</style> | |
<div id="controls"> | |
<h1>Frequency: <span id="frequency"></span></h1> | |
<p> Gross | |
<div> | |
<button value="q">Q</button> | |
<button value="w">W</button> | |
</div> | |
</p> | |
<p> Medium | |
<div> | |
<button value="e">E</button> | |
<button value="r">R</button> | |
</div> | |
</p> | |
<p> Fine | |
<div> | |
<button value="t">T</button> | |
<button value="y">Y</button> | |
</div> | |
</p> | |
<p> | |
<button value="">Play/Pause</button> | |
</p> | |
</div> | |
<script type="text/javascript"> | |
var audioCtx = new (window.AudioContext || window.webkitAudioContext)(), | |
oscillatorNode = audioCtx.createOscillator(), | |
gainNode = audioCtx.createGain(); | |
var options = { | |
mute: true, | |
frequency: 500, | |
direction: '', | |
volume: 0.8, | |
speed: 1, | |
grossTune: 5, | |
mediumTune: 0.5, | |
fineTune: 0.05 | |
}; | |
var keys = [ | |
{ | |
key: 'q', | |
direction: 'down', | |
tune: options.grossTune | |
}, | |
{ | |
key: 'w', | |
direction: 'up', | |
tune: options.grossTune | |
}, | |
{ | |
key: 'e', | |
direction: 'down', | |
tune: options.mediumTune | |
}, | |
{ | |
key: 'r', | |
direction: 'up', | |
tune: options.mediumTune | |
}, | |
{ | |
key: 't', | |
direction: 'down', | |
tune: options.fineTune | |
}, | |
{ | |
key: 'y', | |
direction: 'up', | |
tune: options.fineTune | |
} | |
]; | |
var frequencyElement = document.getElementById('frequency'); | |
oscillatorNode.connect(gainNode); | |
gainNode.connect(audioCtx.destination); | |
oscillatorNode.start(); | |
oscillatorNode.frequency.value = options.frequency; | |
gainNode.gain.value = 0; | |
function setDirectionFrequency() { | |
if (options.direction === 'up'){ | |
options.frequency += options.speed; | |
} | |
if (options.direction === 'down'){ | |
options.frequency -= options.speed; | |
} | |
oscillatorNode.frequency.value = options.frequency; | |
frequencyElement.innerHTML = options.frequency.toFixed(2); | |
} | |
function setNotes(event) { | |
if (event.key === '') { // space bar | |
if (options.mute) { | |
gainNode.gain.value = options.volume; | |
options.mute = false; | |
} else { | |
gainNode.gain.value = 0; | |
options.mute = true; | |
} | |
} | |
for (var i = keys.length - 1; i >= 0; i--) { | |
if(event.key === keys[i].key) { | |
options.direction = keys[i].direction; | |
options.speed = keys[i].tune; | |
} | |
} | |
} | |
function resetDirection() { | |
options.direction = ''; | |
} | |
function keyDown(event) { | |
if (event.target.localName === 'button') { | |
setNotes({key: event.target.value}); | |
} | |
} | |
setInterval(setDirectionFrequency, 40); | |
var element = document.querySelector('#controls'); | |
element.addEventListener('touchstart', keyDown); | |
element.addEventListener('touchend', resetDirection); | |
element.addEventListener('mousedown', keyDown); | |
element.addEventListener('mouseup', resetDirection); | |
document.addEventListener('keydown', setNotes); | |
document.addEventListener('keyup', resetDirection); | |
</script> | |
</body> | |
</html> |
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